If it's cracked clean through to the other side, even if you use some epoxy it'll be prone to crack again with any good amount of force on it. You might be able to get some use, but I don't think anything long-term.

its a kids board right, if he's big enough now give him one of your old deck otherwise kids boards are relatively cheap right, doesnt look all that expensive but I do love the wood grain top sheet, wish more boards had nice old school wooden veneers like ETM has been making

I'll try to do some repairs to it and see how it holds up. I called my buddies shop and I'll see what he has. The boy is going to pay to replace it as well. He earns his own money now, and this is part of the sport

My only real concern is our long weekend of riding at our favorite resort is 3 weeks out and I don't want him relying on this deck. Cuz if it fails bad enough, he would then have to rent a deck and knowing him he would hate it and not enjoy the rest of the weekend.